Jumping physics when game first starts

Unity Engine
1

Hey guys I was wondering if you could let me know why this scenario occurs: When I first hit run, my player can jump very high the first time and after that he jumps at a normal height. Also if I move right or left before jumping he moves normal. Here is my code:

//Public Declaration
    public float moveSpeed = 5f;
    public float jumpSpeed = 15f;

    //Private Declaration
    private Transform groundCheck;
    private bool grounded = true;

    void Awake ()
    {
        //Cache Transform
        groundCheck = transform.Find ("groundCheck");
    }
                       
    void Update ()
    {
        //Set Grounded
        grounded = Physics2D.Linecast (transform.position, groundCheck.position, 1 << LayerMask.NameToLayer ("Ground"));
        Movement ();

    }

    void FixedUpdate ()
    {
        Jump ();   
    }


    //Functions
    void Movement()
    {
        if (Input.GetKey (KeyCode.D))
            transform.Translate (Vector2.right * moveSpeed * Time.deltaTime);
       
        if (Input.GetKey (KeyCode.A))
            transform.Translate (-Vector2.right * moveSpeed * Time.deltaTime);
    }

    void Jump()
    {
        if ( grounded && Input.GetKeyDown (KeyCode.Space))
            rigidbody2D.AddForce (new Vector2 (0f, jumpSpeed));
    }

Any help would be greatly appreciated. Thanks in advance!

2

Not sure if this would help but maybe do the groundcheck in Start instead of Awake?

3

Man, I thought that was going to work. Unfortunately it did not. :frowning: Any other Ideas? This is really stumping me.

4 
 void Update ()
    {
        //Set Grounded
        grounded = Physics2D.Linecast (transform.position, groundCheck.position, 1 << LayerMask.NameToLayer ("Ground"));
        Movement ();
    }

Maybe put that under fixedupdate?

I think it’s running one of the calculations twice. Try debugging to see if the first jump height is indeed twice as much as the normal. Then you’ll know what’s going on.